Combustion promotion



' March 1 7, 1925.

A. FRENCH COMBUSTION PROMOTION 2 Sheets-Sheot 1 Filed Nov. 23, 1923 INVENTOR Mm rmpfi/ Y 2, i

. T'I'ORNEY N INVENTOR 6W MBWQ A TTORNEY 2 Sheets- Shoot ,2

A. FRENCH COMBUSTION. PROMOTION Filed Nov. 23, 1923 March 17, 1925.

Patented Mar. 17, 1925;

UNITED STATES".

ALBERT FRENCH, or BROOKLYN, NEW roux.

comsos'rron PROMOTION.

Application filed November 23, 1923; Serial No. 676,486.

To all whom it may concern:

' Beit known that I, ALBERT FRErIoH, a

' citizen of the United States, and a resident ofBrooklyn, Kings County, and State of New York, have inventedcertain .new and mote combustion of fuel, in boilers and furnaces and to-provide effective means for this purpose which can be readily applied and adapted to existing fuel burning systems.

"Inthe accompanying drawings forming part of this specification, one praoticalgembodiment ofthe invention is illustrated in: -diiferent adaptations toa' furnace and it is to be further understood that the invention a maybe applied andusedin'other different ways and-inother various formsjwithout departureifrom the true spirit and scope of the invention claimed. I I y ,1

Figure 1 is a broken perspective view showlng the invention applied to a conventional type of-coal burning furnace.

Figure 2 is a vertical sectionalvi'ew of the preheater intake which feeds; oxygen into the .top of the combustion chamber.

{Figure Sis a cross sectionalview of the same as taken on substantially the plane of line 33 of-Figure2;

Figure dis a broken plan view of this preheater installation.

Figure 5 is a detached perspective view of the combined intake and air preheating device.

a with the stack or smoke heated air into the top or'b'ac .z portion of the combustion chamber and anotheiki'njector Figure 6 is a longitudinal sectional view of thepreheater chamber.

--Figures7 and 8-are plan and sectional views respectively of the device for spraying preheated air into the front of the coma the nozzles as'a forceful spray.

bustion chamber. I

One special feature of the invention consists in injecting preheated air .both into the I back and'the front of the combustion space in such a way as to agitate and breakup the gases of combustion so as tocause carbon monoxid or, unconsumed gases to combine more fully and completely with the auxlliary supply of oxygen thus furnished.-' In the I illustration this is effected by means of an injector preheater operating 1n con unctlon ashereinafter defined and directly in the flue as indicated in Figures pipe to supply preheater. applied to the furnace door for supplylng heated air into the front of the combustion chamber. 7

The first injectoris shown in the form of a relatively flat hollow shoeor chamber 1 0 having an air inletll in its rear wall and an, inclined front wall 12 which is faced to the interior of the furnace and provided Wlt-h a1r spraymg nozzles 13. These'nozzle's are shown in Figure 6 as tapered toward the1r.d1scharge ends and provided with flared "or cupped outlets 14': and for conivenience of ,inanufacture the front wall'is shown constructed as a separately formed in the body ofthe chamber. The body part of the chamber is shown in the form of a single casting having a dependent lug 15 at the rear for supporting the device on a downward, forward incline and as having a roundedunderssurface to enable it to seat closely. in the bottom of the flue when used 2and3. v .To prevent a too rapid inrush of air and give time for the air to become pro'perly' heated, before admission to the exhaust gases, a 'bafilewall 16, is shown provided direct1y'opp'osite the inlet 11' and this battle is furthermore. shown as forming one of the plateset into an appropriate'seat provided walls ofwa triangular-vertical passage through the preheater body, the othergtwo walls 17 of this passapm convergingtoward the front-and the sides of the chamber being indicated as constricted toward these convergent walls at 18 to-provide-conyergent channels '19 which direct the incoming air in'twoconvergent streams toward the nozzles. The top :of the chamber is shown as inclined downwardly toward the front and the effect asiajwhole is that the induced air as it"is heated and expandsis projected by -The intake for the air is shown in the form of a head f. ,0 'covered by a rotatable valve which can vbe'turn ed to regulate'the volume of admitted, air.- This head is connected with the preheater by suitable plping 21 which is usuallyextended through the smoke pipe 22 of-the furnace.

This fresh air intake may be located I within the furnace room or in. case of a lack of oxygen: may be located in the open air. In'the' construction illustrated the intake is shown located directly below .a

chamber or enlatgementifllr-int'erposed asa i section of the smoke pipe "llhisch-amber ismade of sufficient size'to receive the preheater without diminishing the cross sectional area of the flue so that the preheater may be installed therein as shown in Figures 2 and 3 without retarding the flow of smoke or furnace gases.

In Figure l the-preheater' is-ishown as located directly within the furnace structure. it only being necessary in such a case to provide an extended section of the piping 21 by which the preheater is connected with the air intake outside the furnace. The provision ofthe air inlet in the back of the preheater "thus allows for the installatlon of the preheater either in the furnace or within the smoke pipe chamber and enables the air intake to be disposed, either at the bottom, where shown, or at either side or even at the top of the smoke plpe, as conditions may require.

, The preheater section of the smoke pipe is shown in Figures 2, and 4 as made in the form of two complemental castings 24, 25, having inter-fitting tongue and groove joints E26 and secured together by bolts 27.

These complement-a1 parts are shown as having necks 28 at their opposite ends reduced to the size of the smoke pipe and in order that these may be readily fitted to such piping, either one or both of them may have attached a collar 29 of sheet metal which can be expanded or reduced more orless to adapt it to variations in size of the flue. This construction, it :will be seen, enables the'device to be readily interposed in the usual line of smoke pipe.

The draught through the smoke pipe is shown as controlled by a pivoted damper 30 'journaled in the pipe in'rear of thepreheater and adapted to be positioned by a handle 31. This damper differs from the ordinary in that it is provided on the face toward the preheater with a concavely curved deflector 32 to turn the gases downwardly and back toward the preheater and thus create more or less of. an eddy flow back over the top of the preheater. This damper also is shown as placedquite close to the end of the enlarged section of the pipe and so that when nearly closed as in Figure 2 it will substantially line up with the downwardly inclined breast of the upper pipe section24.

The front prehcater is shown in Figures 7 and S as consisting of a hollow casting 33 closed-bya cap 34 having a dependent hollow projection 85'whi'ch forms a substantially U-shaped channel 36" for the flow of gases from the rear to the front of" the de vices At the front the ,body casting is shown formed with a series .of substantially radially disposedtapered nozzles :37,

\ like those on the other injector provided withwflared mouths-38. illhis air :spraying device is shown supported against the inside of the furnace door 39 by anipple 40 which screws into the inlet 41 in the back wall of the device and has screwed on its outer end, at the outside of the door, a bell shaped intake 42 which can be regulated able support above the fuel bed. The

U-shaped passage 36 provides suflicient area and retards the incoming air enough to in sure proper heating of the same before it is sprayed out over the fuel bed and the heating effect may be enhanced by providing heat-absorbing fins or ribs on the body of the device which'is exposed to the fire, as indicated at 44.

This invention, it will be seen, provides for the admission of regulatable supplies of preheated air to the fuel bed fromsubstantially opposite directions and thereby produces an intimate mixing and more complete combustion of gases. The independent adjustment of the two supplies of air enables securing the best results under widely different conditions of installation. The devices which go to form the several parts of the inventionare simple, relatively inexpensive and can bereadily installed-in the usual furnace equipment.

Vhat I claim is: a

1. In a device of the character disclosed, an air preheating chamber adapted for mountingwithina horizontal smokepipe or furnace structure and having a base-for supporting the same'in such location tilted downwardly and forwardly towardor into the furnace, said chamber having a downwardly inclined front wall faced toward the furnace structure and provided with discharge nozzles extending obliquely of said inclined wall and substantially horizontally in said supportedposition of the preheater, said preheater further having a pipe inlet in the rear wall of the same and by which, an air inlet pipe may be entered'from below or above and at various angles.

2.111 a device of the character disclosed, aniair preheating chamber provided with. a pipe inlet in the rear wall of the same and a downwardly and forwardly inclined front wall withobliquely extending air discharge nozzles, said prehe'ater having a base for supporting the same =within a substantially horizontal vsmoke or furnace flue with said oblique nozzles in the inclined front wall discharging substantially horizontally into the bottom portion of the flue andso below the main vflow of hot furnace :gases through front Wall with obliquely extending air discharge nozzles, saidpreheater having a base for supporting the same within a substantially horizontal smoke or furnace flue with said oblique nozzles in the inclined front wall discharging substantially horizontally into the bottom port-ion of the flue and so below the main flow of hot furnace gases through the flue, the sides of said preheater chamber being constructed in rear of the inclined front wall.

In witness whereof, I have hereunto set my hand this 14th da of November, 1923.

. AIZBERT FRENCH. 

